# [Tails 7.7.1](https://tails.net/news/version_7.7.1/)
This release is an emergency release to fix important security vulnerabilities in _Tor Browser_. # Changes and updates * Update _Tor Browser_ to [15.0.11](https://blog.torproject.org/new-release-tor-browser-15011/), which fixes [several vulnerabilities in _Firefox_ 140.10.1](https://www.mozilla.org/en-US/security/advisories/mfsa2026-36/). We are not aware of these vulnerabilities being exploited in practice until now. * Update _Thunderbird_ to [140.10.0](https://www.thunderbird.net/en-US/thunderbird/140.10.0esr/releasenotes/). * Stop making it possible to start our ISO images from a USB stick. Since [2019](https://tails.net/news/version_3.12/), we recommend _USB images_ to start Tails from a USB stick, which is by far the most common way of running Tails. We still distribute [_ISO images_](https://tails.net/install/download- iso/index.en.html) to start Tails from a DVD or in a virtual machine. Until now, these ISO images worked on USB sticks as well, but provided a degraded experience without automatic upgrades or Persistent Storage. Our ISO images no longer work on USB sticks to save a few megabytes and prevent confusion for people who use USB sticks. For more details, read our [changelog](https://gitlab.tails.boum.org/tails/tails/-/blob/master/debian/changelog). # Get Tails 7.7.1 ## To upgrade your Tails USB stick and keep your Persistent Storage * Automatic upgrades are available from Tails 7.0 or later to 7.7.1. * If you cannot do an automatic upgrade or if Tails fails to start after an automatic upgrade, please try to do a [manual upgrade](https://tails.net/doc/upgrade/index.en.html#manual). ## To install Tails 7.7.1 on a new USB stick Follow our [installation instructions](https://tails.net/install/index.en.html). The Persistent Storage on the USB stick will be lost if you install instead of upgrading. ## To download only If you don't need installation or upgrade instructions, you can download Tails 7.7.1 directly: * [For USB sticks (USB image)](https://tails.net/install/download/index.en.html) * [For DVDs and virtual machines (ISO image)](https://tails.net/install/download-iso/index.en.html) URL: <https://tails.net/news/version_7.7.1/>
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